Given a string of digits, calculate the largest product for a contiguous substring of digits of length n.
For example, for the input '1027839564'
, the largest product for a series of 3 digits is 270 (9 * 5 * 6)
, and the largest product for a series of 5 digits is 7560 (7 * 8 * 3 * 9 * 5)
.
Note that these series are only required to occupy adjacent positions in the input; the digits need not be numerically consecutive.
For the input '73167176531330624919225119674426574742355349194934'
,
the largest product for a series of 6 digits is 23520.
For a series of zero digits, the largest product is 1 because 1 is the multiplicative identity. (You don't need to know what a multiplicative identity is to solve this problem; it just means that multiplying a number by 1 gives you the same number.)
Sign up to Exercism to learn and master CFML with 28 exercises, and real human mentoring, all for free.